Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net revenues	$ 2,191.5	$ 1,535.5	$ 4,583.7	$ 3,356.7
Cost of sales:
Cost of materials and other	1,995.8	1,277.8	4,201.3	3,188.4
Operating expenses (excluding depreciation and amortization presented below)	129.6	103.4	257.6	232.6
Depreciation and amortization	60.5	53.6	122.8	100.6
Total cost of sales	2,185.9	1,434.8	4,581.7	3,521.6
Operating expenses related to retail and wholesale business (excluding depreciation and amortization presented below)	31.5	24.4	52.8	49.7
General and administrative expenses	58.6	61.7	105.7	127.4
Depreciation and amortization	5.8	6.0	12.0	11.6
Other operating income, net	(4.9)	(14.2)	(3.0)	(14.9)
Total operating costs and expenses	2,276.9	1,512.7	4,749.2	3,695.4
Operating (loss) income	(85.4)	22.8	(165.5)	(338.7)
Interest expense	33.2	29.8	62.8	66.1
Interest income	(0.1)	(0.5)	(0.3)	(2.2)
Income from equity method investments	(6.8)	(10.7)	(11.6)	(15.8)
Gain on sale of non-operating refinery	0.0	(56.9)	0.0	(56.9)
Other expense (income), net	6.8	(1.5)	5.8	(2.4)
Total non-operating expense (income), net	33.1	(39.8)	56.7	(11.2)
(Loss) income before income tax benefit	(118.5)	62.6	(222.2)	(327.5)
Income tax benefit	(46.0)	(35.9)	(58.4)	(119.0)
(Loss) income from continuing operations, net of tax	(72.5)	98.5	(163.8)	(208.5)
Discontinued operations:
Net (loss) income	(72.5)	98.5	(163.8)	(208.5)
Net income attributed to non-controlling interests	8.6	10.8	15.9	18.2
Net (loss) income attributable to Delek	$ (81.1)	$ 87.7	$ (179.7)	$ (226.7)
Basic income (loss) per share:
Basic (loss) income per share (USD per Share)	$ (1.10)	$ 1.19	$ (2.43)	$ (3.08)
Diluted income (loss) per share:
Diluted (loss) income per share (USD per share)	(1.10)	1.18	(2.43)	(3.08)
Dividends declared per common share outstanding (in dollars per share)	$ 0	$ 0.31	$ 0	$ 0.62